Engineering Inputs to Increase Impact of the CDC Safe Water System Program. Daniele S. Lantagne, PE
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1 Engineering Inputs to Increase Impact of the CDC Safe Water System Program Daniele S. Lantagne, PE
2 Mortality and Morbidity From Unsafe Drinking Water Each year: million persons die from waterborne diseases Each day: 5,000 children die from infectious diarrhea acquired from unsafe drinking water Each year: 1 billion episodes of diarrhea are caused by unsafe drinking water
3 Global Burden of Unsafe Water Over 1 billion persons have no access to improved water sources Hundreds of millions more drink unsafe water from improved sources
4 Millennium Development Goals Widely accepted development goals Sustainable development, poverty alleviation By 2015: Reduce in half the population without improved water Requires 125,000 people per day gain access No population growth or loss of access World Bank estimate 300,000 per day (behind in sub-saharan Africa)
5 Overarching Goal: Infrastructure Advantages of Infrastructure Provision of reliable, quality water Economic Social Aesthetic Disease reduction Increase quantity Improvement hygiene Water as Human Right
6 Post-source Water Contamination
7 CDC Safe Water System Treat drinking water at the point of use Store treated drinking water safely Dilute sodium hypochlorite bleach Narrow-mouthed, lidded vessels with spigots
8
9 Safe Water System Results Reduces diarrhea by ~50% Consistently Peer-reviewed literature Projects driven by Demand creation Emergency response Use in non-traditional places Markets in Bolivia Set the standard for evaluation of health impact
10 Safe Water System Partners Funding: USAID, WHO, UNICEF, Rotary International, JICA, Procter & Gamble, DFID Production: Local private sector companies Implementation: PSI, CARE, small NGOs Political support: MOW, MOH Technical Assistance: CDC Evaluation: CDC, Universities
11 Project Partner: PSI Largest social marketing NGO in world Condoms, bednets, birth control, water Scale Launched 14 countries 7 on deck Sales of over 12 million bottles 8 million bottles per year Social marketing, partner with NGOs
12 PSI Social Marketing
13 Safe Water System Products
14 Product Design - Historical Method Each country develop own dose Large variation of chlorine added No mechanism for comparison Used existing bottle/caps in country Large caps (10 ml), low concentration Inefficient pilot project mentality Madagascar 0.39 USD per 500 ml bottle (0.19 subsidy) 0.4% solution
15 Dosing Testing Methodology Determine how much chlorine is needed to ensure safe water for 24 hours of storage Obtain samples from each type of source used Add chlorine in different concentrations Measure chlorine residual over 24 hours Free chlorine residual: Free chlorine residual: Quality control critical < 2.0 mg/l at 30 minutes > 0.2 mg/l at 24 hours Responsibility in developing countries to do US quality work
16 Mechanism to Compare: Dose Factor DF = [Hypochlorite] (%) Amount added (20L, clear) (ml) Dose (mg/l w ) = [Hypochlorite] (mg/l Cl ) Amount added (ml Cl ) 20 (L w ) 1000 ml / 1L
17 Dosage Testing Results Before Standardization of Testing Dose Factors: (median 4) After Standardization of Testing In 73 of 87 (84%) unchlorinated samples from 13 countries a dose factor of 3.75 (clear) 7.5 (turbid) acceptable Consistent with WHO and Clorox drop recommendations In 14 samples (16%) not found to be acceptable Excessive turbidity 57% Excessive metals 21% Best treated with or between 3.75 and %
18
19 Dosing Testing - New Method Start with 3.75 / 7.5 regime Ensure accurate Do not treat each country as pilot project Do not dose for one area (Kenya earth ponds / Antananarivo)
20 Product Development - Variable Concept Cap Size (ml) Concentration (%) Factor (one cap) Dosing: Clear Dosing: Dirty Uses: 150 ml bottle Liters treated (1 bottle) /2 cap 1 cap cap 2 cap cap 2 cap cap 2 cap
21 Regional Product? Ideal Bottle 150 ml bottle, 3 ml cap, 1.25% solution 50 uses (1.5 months) Dose factor of 3.75 for 20 L bucket One cap / two cap dosing scheme Cost: USD 0.68 PYTW per bottle Evolving ideal Potential for regional product
22 Regional Product Decision made to proceed Caps made and exported from Kenya 12,000 USD mold 1.1 US cents each ex-factory Bottle mold made in Kenya Exported to country Regional - PSI Uganda, Kenya, Ethiopia, Burundi, Mozambique, Tanzania, (Madagascar) Vietnam, Cameroon, (Nigeria) On deck: Malawi, Angola, DRC, Rwanda
23 Advantages Simplifies program initiation Allows for cross-border response Cap economies of scale 3 cents in Germany, 1.1 in Kenya Cost - 54% reduction Madagascar (old): 0.39 USD Madagascar (new): 0.18 USD
24 Engineering Critical Points Consistent water quality testing Analysis and comparing of results Industrial Design User needs, label, PSI needs, transport, hand-feel, cost Cap Allowed us to move from national to regional scale in Africa
25 Projected Power of Partnership Safe Water System: million users Safe Water System: million users Unsafe Water PSI Expansion
26 Thank you. I am happy to take questions, and appreciate your attention and input. Daniele Lantagne, PE CDC dul4@cdc.gov
27 Outline of Presentation Diarrheal Disease SWS Background Our Product Engineering Inputs Dosage Industrial Design Implementation with PSI Benefits of new design Plans for the future
28
29 Goal: Health Impact * Hygiene Sanitation Water supply Water quality Multiple Esrey Current Intervention
30 Infrastructure: Limitations Necessitates Political stability Large investment of public dollars Terrain conducive Population density Alternative options promoted Supply Sanitation Hygiene
31 Other POU Treatment Options PuR Biosand Filtration Ceramic Filtration SODIS UV Multiple barrier
32 International Network to Promote Household Water Treatment and Safe Storage WHO Consortium and Secretariat: To contribute to a significant reduction in waterborne disease, especially among vulnerable populations, by promoting household water treatment and safe storage as a key component of water, sanitation and hygiene programmes.
33 Safe Water System Results Consistently reduces diarrheal disease incidence in randomized, controlled, published studies Uzbekistan Bolivia Zambia Pakistan Uganda Kenya (Western) % overall 44% overall, 53% in infants 48% overall 73% overall 30% in HIV-infected persons 22%, 25% in under-1 s Publications available from safewater@cdc.gov
34 Why the SWS? CDC Perspective Evaluation Matrix for POU Laboratory testing, Field testing Health Impact, Scalability Chlorine is: Inexpensive, effective Simple to make and use 100 year of experience Available worldwide Possible to verify use in home PSI Perspective Health impact gold standard High impact:cost ration Necessary Characteristics Marketable Transportable Easy to use Affordable
35 Why the CDC/PSI Partnership? CDC Perspective Ability to go to scale PSI Perspective Technical assistance
36 Dose Factor: Other Clorox 3 drops of 5.25% to 1 gallon of water 0.15 ml 5.25% 5 = Dose Factor 3.94 WHO 5 drops of 5.25% to 1 gallon (emergency) 0.25 ml 5.25% 5 = Dose Factor 6.56 Dosing determined by CDC comparable to research completed by other agencies
37 Side Note: Ways to Clarify Mechanisms: Filtration Settling and Decanting Moringa/Alum Move water from double to single dose Complicates IEC messages NGO partner?
38 Sample label: Nigeria
39 Kenya NGO Model: SWAK National NGO Links existing village groups Trainings on legal issues, health, water Sell PuR and WaterGuard Income generating Move product to areas outside market Evaluation ongoing
40 Successful Collaboration Model Clinic Results >80% patients received knowledge Correct handwashing 45% (47/105) >80% 4 of 6 steps Chlorine Residual 65% (73/112)
41 Step 10: Education on WSH World Esrey study Meta-analysis of health impact Hygiene, sanitation, water supply, water quality Water quality smallest reduction Informed W&S decade Two new meta-analysis World Bank, London School Water quality and hygiene most effective Critiques of chlorine THMs, bleach safety, overdosing
42 Critique: THM s THM s are disinfection by-products Created by rxn of chlorine, organic material Regulated by EPA and WHO One of four is known cancer-causing agent Major critique of chlorination Risk 1 in 100,000 will get cancer after 70 years Compare to risk of diarrhea in under-5 s Fact Sheet(s) on CDC web site
43
44 Critique: Bleach Safety Safety of bleach in house Concern: children drinking Racciopi, et al study Poison Control Centers in Europe minor, transient effects on health Bad taste Risk of overdosing water Danger is THMs (risk low) Bad taste (won t drink) Marketing risk
45 Common SWS Misconceptions Contraceptive Picture of family (Nigeria) Decrease in libido Assume it s drinking water Use to cook rice Medicine
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